Research Of Sensorless Brushless DC Motor Control System Based On DSP

Brushless DC motor(BLDCM) is a kind of electromechanical integration machinery, and it has been rapidly developing in recent years with the help of the development of power electronic technique and the appearance of new type of permanent magnet material. The use of sensorless control reduces the size of BLDCM, lowers its costs and reinforces its interference immunity, thereby widening its application areas. As a consequence, the research on position-sensorless control for BLDCM has been a hot spot all along in recent years.Based on analyzing and summarizing some problems existing in former BLDCM control system, we introduce one kind of sensorless control system for brushless DC motor based on DSP. This new family of DSP TMS320LF2407A enables cost-effective design of intelligent controllers for brushless motors which can fulfill more conditions, consisting of fewer system components which can fulfill more conditions, consisting of fewer system components, lower system cost and increased performances. This thesis establishes the whole simulation model for the sensorless BLDCM Drives, A new back electromotive force (EMF) detection method was presented for the sensorless control system of BLDCM; the control structure, technology, strategy and chip are confirmed by the timing principle;The hardware circuit is designed based on TI's DSP-TMS320LF2407A and IR's driving chip-IR2133 and ST's MOSDFET P75NF75; Working out initialization programme of some main components and the whole frames, the software programes is written with assemble language of DSP and C; The Matlab/Simulink simulation which aimed at the BLDC motor control system has been executed, the results that the control strategy is reasonable.